Airplane



FIG. 1 is an upper frontal side perspective view of an airplane showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a lower rear side perspective view thereof. 

The ornamental design for an airplane, as shown and described. 